Sample details

The DLS–II aimed to examine normal development from middle to old age and identify the "normal" psychological, social, and biomedical changes that characterize middle and later life. It was initiated to complement features of the First Duke Longitudinal Study (DLS – I) by including a younger sample of late middle-aged adults. Participants in DLS-II were selected from a list of Durham, North Carolina area subscribers to a health insurance provider. There were around 500 participants at baseline, aged from their mid-40s to early-70s. Data were collected in four waves over six years: 1968-1970, 1970-1972, 1972-1974, and 1974-1976.

Study design

Cohort

Number of participants at first data collection

502

Age at first data collection

45 - 71

Participant year of birth

Varied

Participant sex

MF

Representative sample

No

Sample features

Older and elderly peopleMiddle-aged people

Dataset details

Country

United States of America

Year of first data collection

2025-02-18T10:36:17.495000+00:00

Primary institutions

Duke University

Links

Primary URL

Profile paper DOI

https://doi.org/10.1093/geront/gnt049

Funders

National Institutes of Health (NIH)

Ongoing?

No

Data types collected

Not specifiedStandard measures